dou·ble /ˈdʌbəl/
 雙精度型兩倍(a.)兩倍的,雙重的(vt.)使加倍(vi.)加倍,快步走,加倍努力


 double
 二倍


 double
 雙軌邏輯


 double
 雙 雙倍


 Dou·ble a.
 1. Twofold; multiplied by two; increased by its equivalent; made twice as large or as much, etc.
    Let a double portion of thy spirit be upon me.   -- 2 Kings ii. 9.
    Darkness and tempest make a double night.   --Dryden.
 2. Being in pairs; presenting two of a kind, or two in a set together; coupled.
 [Let] The swan, on still St. Mary's lake,
 Float double, swan and shadow.   --Wordsworth.
 3. Divided into two; acting two parts, one openly and the other secretly; equivocal; deceitful; insincere.
    With a double heart do they speak.   -- Ps. xii. 2.
 4. Bot. Having the petals in a flower considerably increased beyond the natural number, usually as the result of cultivation and the expense of the stamens, or stamens and pistils. The white water lily and some other plants have their blossoms naturally double.
 Note: ☞ Double is often used as the first part of a compound word, generally denoting two ways, or twice the number, quantity, force, etc., twofold, or having two.
 Double base, or Double bass Mus., the largest and lowest-toned instrument in the violin form; the contrabasso or violone.
 Double convex. See under Convex.
 Double counterpoint Mus., that species of counterpoint or composition, in which two of the parts may be inverted, by setting one of them an octave higher or lower.
 Double court Lawn Tennis, a court laid out for four players, two on each side.
 Double dagger Print., a reference mark (‡) next to the dagger (†) in order; a diesis.
 Double drum Mus., a large drum that is beaten at both ends.
 Double eagle, a gold coin of the United States having the value of 20 dollars.
 Double entry. See under Bookkeeping.
 Double floor Arch., a floor in which binding joists support flooring joists above and ceiling joists below. See Illust. of Double-framed floor.
 Double flower. See Double, a., 4.
 Double-framed floor Arch., a double floor having girders into which the binding joists are framed.
 Double fugue Mus., a fugue on two subjects.
 Double letter. (a) Print. Two letters on one shank; a ligature. (b) A mail requiring double postage.
 Double note Mus., a note of double the length of the semibreve; a breve. See Breve.
 Double octave Mus., an interval composed of two octaves, or fifteen notes, in diatonic progression; a fifteenth.
 Double pica. See under Pica.
 Double play Baseball, a play by which two players are put out at the same time.
 Double plea Law, a plea alleging several matters in answer to the declaration, where either of such matters alone would be a sufficient bar to the action. --Stephen.
 Double point Geom., a point of a curve at which two branches cross each other. Conjugate or isolated points of a curve are called double points, since they possess most of the properties of double points (see Conjugate). They are also called acnodes, and those points where the branches of the curve really cross are called crunodes. The extremity of a cusp is also a double point.
 Double quarrel. Eccl. Law See Duplex querela, under Duplex.
 Double refraction. Opt. See Refraction.
 Double salt. Chem. (a) A mixed salt of any polybasic acid which has been saturated by different bases or basic radicals, as the double carbonate of sodium and potassium, NaKCO3.6H2O. (b) A molecular combination of two distinct salts, as common alum, which consists of the sulphate of aluminium, and the sulphate of potassium or ammonium.
 Double shuffle, a low, noisy dance.
 Double standard Polit. Econ., a double standard of monetary values; i. e., a gold standard and a silver standard, both of which are made legal tender.
 Double star Astron., two stars so near to each other as to be seen separate only by means of a telescope. Such stars may be only optically near to each other, or may be physically connected so that they revolve round their common center of gravity, and in the latter case are called also binary stars.
 Double time Mil.. Same as Double-quick.
 Double window, a window having two sets of glazed sashes with an air space between them.


 Dou·ble adv. Twice; doubly.
    I was double their age.   --Swift.


 Dou·ble, v. t. [imp. & p. p. Doubled p. pr. & vb. n. Doubling ]
 1. To increase by adding an equal number, quantity, length, value, or the like; multiply by two; as, to double a sum of money; to double a number, or length.
    Double six thousand, and then treble that.   --Shak.
 2. To make of two thicknesses or folds by turning or bending together in the middle; to fold one part upon another part of; as, to double the leaf of a book, and the like; to clinch, as the fist; -- often followed by up; as, to double up a sheet of paper or cloth.
 Then the old man
 Was wroth, and doubled up his hands.   --Tennyson.
 3. To be the double of; to exceed by twofold; to contain or be worth twice as much as.
 Thus reënforced, against the adverse fleet,
 Still doubling ours, brave Rupert leads the way.   --Dryden.
 4. To pass around or by; to march or sail round, so as to reverse the direction of motion.
    Sailing along the coast, the doubled the promontory of Carthage.   --Knolles.
 5. Mil. To unite, as ranks or files, so as to form one from each two.


 Dou·ble, v. i.
 1. To be increased to twice the sum, number, quantity, length, or value; to increase or grow to twice as much.
    'T is observed in particular nations, that within the space of three hundred years, notwithstanding all casualties, the number of men doubles.   --T. Burnet.
 2. To return upon one's track; to turn and go back over the same ground, or in an opposite direction.
    Doubling and turning like a hunted hare.   --Dryden.
    Doubling and doubling with laborious walk.   --Wordsworth.
 3. To play tricks; to use sleights; to play false.
 What penalty and danger you accrue,
 If you be found to double.   --J. Webster.
 4. Print. To set up a word or words a second time by mistake; to make a doublet.
 To double upon Mil., to inclose between two fires.


 Dou·ble, n.
 1. Twice as much; twice the number, sum, quantity, length, value, and the like.
    If the thief be found, let him pay double.   --Ex. xxii. 7.
 2. Among compositors, a doublet (see Doublet, 2.); among pressmen, a sheet that is twice pulled, and blurred.
 3. That which is doubled over or together; a doubling; a plait; a fold.
 Rolled up in sevenfold double
 Of plagues.   --Marston.
 4. A turn or circuit in running to escape pursues; hence, a trick; a shift; an artifice.
    These men are too well acquainted with the chase to be flung off by any false steps or doubles.   --Addison.
 5. A person or thing that is the counterpart of another; a duplicate; copy; (Obs.) transcript; -- now chiefly used of persons. Hence, a wraith.
    My charming friend . . . has, I am almost sure, a double, who preaches his afternoon sermons for him.   --Atlantic Monthly.
 6. A player or singer who prepares to take the part of another player in his absence; a substitute; -- used especially of a person who resembles an actor and takes the actor's place in scenes requiring special skills; as, a stunt double.
 7. Double beer; strong beer.
 8. Eccl. A feast in which the antiphon is doubled, hat is, said twice, before and after the Psalms, instead of only half being said, as in simple feasts.
 9. Lawn Tennis A game between two pairs of players; as, a first prize for doubles.
 10. Mus. An old term for a variation, as in Bach's Suites.

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 double
      adj 1: having more than one decidedly dissimilar aspects or
             qualities; "a double (or dual) role for an actor";
             "the office of a clergyman is twofold; public
             preaching and private influence"- R.W.Emerson; "every
             episode has its double and treble meaning"-Frederick
             Harrison [syn: dual, twofold, treble, threefold]
      2: consisting of or involving two parts or components usually
         in pairs; "an egg with a double yolk"; "a double (binary)
         star"; "double doors"; "dual controls for pilot and
         copilot"; "duple (or double) time consists of two (or a
         multiple of two) beats to a measure" [syn: dual, duple]
      3: twice as great or many; "ate a double portion"; "the dose is
         doubled"; "a twofold increase" [syn: doubled, twofold]
      4: used of flowers having more than the usual number of petals
         in crowded or overlapping arrangements; "double
         chrysanthemums have many rows of petals and are usually
         spherical or hemispherical" [ant: single]
      5: used of homologous chromosomes associated in pairs in
         synapsis [syn: bivalent] [ant: multivalent, univalent]
      6: large enough for two; "a double bed"; "a double room"
      7: having two meanings with intent to deceive; "a sly double
         meaning"; "spoke with forked tongue" [syn: forked]
      n 1: a base hit on which the batter stops safely at second base;
           "he hit a double to deep centerfield" [syn: {two-base
           hit, two-bagger, two-baser]
      2: a stand-in for movie stars to perform dangerous stunts; "his
         first job in Hollywood was as a double for Clark Gable"
         [syn: stunt man, stunt woman]
      3: someone who closely resembles a famous person (especially an
         actor); "he could be Gingrich's double"; "she's the very
         image of her mother" [syn: image, look-alike]
      4: a quantity that is twice as great as another; "36 is the
         double of 18"
      5: raising the stakes in a card game by a factor of 2; "I
         decided his double was a bluff" [syn: doubling]
      adv 1: downward and forward; "he was bent double with pain"
      2: two together; "some people sleep better double"
      3: to double the degree; "she was doubly rewarded"; "his eyes
         were double bright" [syn: doubly, twice]
      v 1: increase twofold; "The population doubled within 50 years"
           [syn: duplicate]
      2: hit a two-base hit
      3: bend over or curl up, usually with laughter or pain; "He
         doubled and vomited violently" [syn: double over, {double
         up]
      4: do double duty; serve two purposes or have two functions;
         "She doubles as his wife and secretary"
      5: bridge: make a demand for (a card or suit)
      6: make or do or perform again; "He could never replicate his
         brilliant performance of the magic trick" [syn: duplicate,
          reduplicate, repeat, replicate]